My opk has been positive 2 days now when will i ovulate?

Ovulation prediction: Ovulation predictor kits (opk) predict when you will ovulate. When you detect the first positive that means you will ovulate within the next 24 hours. That means ovulation takes place next day after positive test. Once you see the first positive, you don't need to continue checking as the test will stay positive for 2 days then turn negative again.